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What brand of oil and type should I use in this truck. I've used Rotella 15-40 in my 1998 without any problems. I have Mobile Delvac 15-40 any suggestions?
 

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According to the "Fluids, Lubricants and Genuine Parts" section of the Diesel Supplement with your Owner's Manual regarding engine oil: "Only use ACEA C3 5W-30 Synthetic Low Ash engine oil meeting FCA Material Standard MS-11106 or Pennzoil Ultra Euro L full synthetic 5W-30 motor oil."
 

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According to the "Fluids, Lubricants and Genuine Parts" section of the Diesel Supplement with your Owner's Manual regarding engine oil: "Only use ACEA C3 5W-30 Synthetic Low Ash engine oil meeting FCA Material Standard MS-11106 or Pennzoil Ultra Euro L full synthetic 5W-30 motor oil."
Maybe for a RAM 1500 EcoDiesel.....but not for a HD 2500 / 3500 w/6.7L Cummins. :nono

15W40 in either Rotella or Delvac will be fine unless you anticipate any temps falling below 0*F. If at or below 0*F, 5W40 synthetic should be used.
 
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